For PDO, we’ve already moved all our projects to PDO, and it’s been my preferred method of accessing databases for at least a year and a half already. Great stuff. We’ve also used the json module for quite some time, which neatly ties into jQuery , mootools and other JavaScript APIs. I still haven’t used SPL that much, but that might change soon. Anyways, a good read for anyone who still live in the PHP4 world..